#include <bits/stdc++.h>
using namespace std;

int main(){
    double before,input;
    cin>>before>>input;
    cout<<char(92);
    printf("0/\n"
           "operation success!\n"
           "before:%.2f\n"
           "after:%.2f\n"
           "see you next time!\n",before,before+input);
    return 0;
}